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Old 01-21-2012, 04:21 PM   #1
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Default 2002 f150 373 gears

I have a 2002 f150 extended cab 4.6l automatic. What kind of gears does it come with stock in the rear end? I want to put a detroit locker(DO NOT WANT LIMITED SLIP) and 373 gears. Any problems with this? I've never worked on anything like this so give me all the details you can!
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Old 01-21-2012, 05:44 PM   #2
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look at the code on the door jamb sticker. B6 is a 3.73, but Im pretty sure FX4s and 7700 only came with 3.73 in 97-03
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Old 01-21-2012, 09:38 PM   #3
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XLTs come with 3.55s
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Old 01-21-2012, 10:43 PM   #4
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Most likely 3.55's unless it was special ordered...

If you happen to have the bigger 9.75 rear I have a new set of 3.73 gears for sale for cheap! (being you have the 4.6 engine, you probably have the 8.8)
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Old 01-22-2012, 08:03 PM   #5
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Quote:
Originally Posted by racin4ds View Post
Most likely 3.55's unless it was special ordered...

If you happen to have the bigger 9.75 rear I have a new set of 3.73 gears for sale for cheap! (being you have the 4.6 engine, you probably have the 8.8)
Dang. I have an 8.8.
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Old 01-22-2012, 08:05 PM   #6
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howcome you want to get rid of your limited slip? if you dont mind me asking.
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Old 01-22-2012, 08:31 PM   #7
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If you read, he WANTS 3.73s... He wants a Detroit locker, NOT a limited slip carrier, he never said he had a limited slip diff...

Judging by what he's said so far he has an 8.8 with an open diff most likely in a 3.55 ratio...
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Old 01-22-2012, 08:41 PM   #8
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Quote:
Originally Posted by A7X View Post
If you read, he WANTS 3.73s... He wants a Detroit locker, NOT a limited slip carrier, he never said he had a limited slip diff...

Judging by what he's said so far he has an 8.8 with an open diff most likely in a 3.55 ratio...
i swear dude. here we go with me miss reading **** lol A7X just pretend i didnt post anything if i post one more miss read or incorrect info post.

i did misread but i thought they all came with a limited slip rear? my friend has a 99 with an open but i thought they stopped putting them in after 2000.
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Old 01-22-2012, 08:52 PM   #9
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Quote:
Originally Posted by DillonBerkley
I have a 2002 f150 extended cab 4.6l automatic. What kind of gears does it come with stock in the rear end? I want to put a detroit locker(DO NOT WANT LIMITED SLIP) and 373 gears. Any problems with this? I've never worked on anything like this so give me all the details you can!
Your cheapest scenario would be to pull a 9.75 from an 02+ FX4 or an expy and swap it in for the stronger rear and a limited slip with 3.73 $200.00 for the axle and a few hours for install...

But since you don't wasn't a limited slip diff...

Buy the gear set and master install kit, $280.00 for a good set...

Locker, $500.00 ish

Then about $600.00 for the install...

Or perform the labor yourself if you have the right tools and can measure to the .001" and can follow torque patterns and torque specs etc...

Pull wheels, brakes, rotors
Diff cover, carrier center pin
Push in axles and remove c-clips
Remove axles
Remove carrier bearing caps
Remove carrier
Remove drive shaft
Remove pinion nut
Drive pinion out with a drift pin
Drive out pinion bearing races
Install new races
make a setup bearing
Install pinion with proper shims and setup bearing with no crush sleeve at 15-19 inlbs
Install ring gear on locker
press bearings on Locker
Install locker
Set backlash .008"-.010"
Check mesh pattern

If it's all correct (not likely) tear it down and install with the permanent pinion bearing and a crush sleeve...

If not tear it down and re shim accordingly reinstall and check again...

I've done the installs on the 8.8 and 9.75... It's time consuming and you need to know what you're doing, if you wing it you can and will grenade your differential, end up with noise or howling, this is precision work... Most would think you can get it close enough...

The gears are precision machined for a reason, they don't just slop together... they are precision installed
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Old 01-22-2012, 08:56 PM   #10
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Quote:
Originally Posted by A7X View Post
Your cheapest scenario would be to pull a 9.75 from an 02+ FX4 or an expy and swap it in for the stronger rear and a limited slip with 3.73 $200.00 for the axle and a few hours for install...

But since you don't wasn't a limited slip diff...

Buy the gear set and master install kit, $280.00 for a good set...

Locker, $500.00 ish

Then about $600.00 for the install...

Or perform the labor yourself if you have the right tools and can measure to the .001" and can follow torque patterns and torque specs etc...

Pull wheels, brakes, rotors
Diff cover, carrier center pin
Push in axles and remove c-clips
Remove axles
Remove carrier bearing caps
Remove carrier
Remove drive shaft
Remove pinion nut
Drive pinion out with a drift pin
Drive out pinion bearing races
Install new races
make a setup bearing
Install pinion with proper shims and setup bearing with no crush sleeve at 15-19 inlbs
Install ring gear on locker
press bearings on Locker
Install locker
Set backlash .008"-.010"
Check mesh pattern

If it's all correct (not likely) tear it down and install with the permanent pinion bearing and a crush sleeve...

If not tear it down and re shim accordingly reinstall and check again...

I've done the installs on the 8.8 and 9.75... It's time consuming and you need to know what you're doing, if you wing it you can and will grenade your differential, end up with noise or howling, this is precision work... Most would think you can get it close enough...

The gears are precision machined for a reason, they don't just slop together... they are precision installed
geez. that seems like a ton of work.
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